Eystein Glumra ("Eystein the Noisy" or "Eystein the Clatterer"; Modern Norwegian Øystein Glumra) also known as Eystein Ivarsson, was reputedly a petty king on the west coast of Norway, during the 9th Century.
The Heimskringla saga states that Eystein Glumra was the father of Rognvald Eysteinsson and Sigurd Eysteinsson: "The first earl in the Orkney Islands was called Sigurd, who was a son of Eystein Glumra, and brother of Ragnvald earl of More. After Sigurd, his son Guthorm was earl for one year. After him Torf-Einar, a son of Ragnvald, took the earldom, and was long earl, and was a man of great power".
According to the Orkneyinga Saga, Eystein Glumra was the son of Ivar the jarl of Uplanders and grandson of Halfdan the Old. Orkneyinga Saga also named Eystein Glumra as the father of Rognvald Eysteinsson: "Heiti, Gorr’s son, was father of Sveiði the sea-king, [who was] the father of Halfdan the old, [who was] the father of Ivar the Uplanders’ earl, [who was] the father of Eystein the noisy, [who was] the father of earl Rognvald the mighty and wise in council".
- Heimskringla - Saga of Olaf Haraldson
- Norsk Biografisk Leksikon, (19 volumes. Oslo: Aschehoug, 1921-1982), FHL book 948.1 D36n., vol. 11 p. 272-273.
- Våre Forfedre, Bugge, Mogens Fraas, (Olso: I kommisjon hos Cammermeyers Boghandel, 1939), FHL book 929.2481 B865b., p. 34.
- Claus Krag. "Ragnvald Øysteinsson Mørejarl". Norsk biografisk leksikon. Archived from the original on 2015-01-17. Retrieved July 15, 2016.
- "Earl Sigurd The Mighty - The First Earl of Orkney". orkneyjar.com. Retrieved July 15, 2016.
- The Orkneyingers’ Saga
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